15171252787461 has 4 divisors (see below), whose sum is σ = 20228337049952. Its totient is φ = 10114168524972.

The previous prime is 15171252787451. The next prime is 15171252787489. The reversal of 15171252787461 is 16478725217151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 15171252787461 - 2¹⁹ = 15171252263173 is a prime.

It is a super-2 number, since 2×15171252787461² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15171252787451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2528542131241 + ... + 2528542131246.

It is an arithmetic number, because the mean of its divisors is an integer number (5057084262488).

Almost surely, 2^{15171252787461} is an apocalyptic number.

It is an amenable number.

15171252787461 is a deficient number, since it is larger than the sum of its proper divisors (5057084262491).

15171252787461 is an equidigital number, since it uses as much as digits as its factorization.

15171252787461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057084262490.

The product of its digits is 6585600, while the sum is 57.

The spelling of 15171252787461 in words is "fifteen trillion, one hundred seventy-one billion, two hundred fifty-two million, seven hundred eighty-seven thousand, four hundred sixty-one".